﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Sinacor.Infra.UI.Controls.SmartClient;
using System.Windows.Controls.Primitives;
using System.Runtime.InteropServices;
using System.Windows.Interop;
using System.Diagnostics;
using System.Threading;

namespace Sinacor.Infra.UI.Controls.SmartClient
{
    public abstract class SinacorWindowBase : System.Windows.Window
    {
		#region WINDOWS MESSAGE LISTENER

		void win_SourceInitialized(object sender, EventArgs e)
		{
			System.IntPtr handle = (new WindowInteropHelper(this)).Handle;
			HwndSource.FromHwnd(handle).AddHook(new HwndSourceHook(WindowProc));
		}

		static System.IntPtr WindowProc(System.IntPtr hwnd, int msg, System.IntPtr wParam, System.IntPtr lParam, ref bool handled)
		{
			switch (msg)
			{
				case 0x0024:
					//WmGetMinMaxInfo(hwnd, lParam);
					handled = true;
					break;
				case 0x14:
					handled = true;
					//EventLog.WriteEntry("WorkAreaChanged", "");
					break;
			}
			return (System.IntPtr)0;
		}

		static void WmGetMinMaxInfo(System.IntPtr hwnd, System.IntPtr lParam)
		{
			MINMAXINFO mmi = (MINMAXINFO)Marshal.PtrToStructure(lParam, typeof(MINMAXINFO));

			int MONITOR_DEFAULTTONEAREST = 0x00000002;
			System.IntPtr monitor = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);

			if (monitor != System.IntPtr.Zero)
			{
				MONITORINFO monitorInfo = new MONITORINFO();
				GetMonitorInfo(monitor, monitorInfo);
				RECT rcWorkArea = monitorInfo.rcWork;
				RECT rcMonitorArea = monitorInfo.rcMonitor;
				mmi.ptMaxPosition.x = Math.Abs(rcWorkArea.left - rcMonitorArea.left);
				mmi.ptMaxPosition.y = Math.Abs(rcWorkArea.top - rcMonitorArea.top);
				mmi.ptMaxSize.x = rcWorkArea.Width;
				mmi.ptMaxSize.y = rcWorkArea.Height;
				//mmi.ptMaxSize.x = Math.Abs(rcWorkArea.right - rcWorkArea.left);
				//mmi.ptMaxSize.y = Math.Abs(rcWorkArea.bottom - rcWorkArea.top) - 1;
			}
			Marshal.StructureToPtr(mmi, lParam, true);
		}

		[StructLayout(LayoutKind.Sequential)]
		public struct POINT
		{
			public int x;
			public int y;
			public POINT(int x, int y)
			{
				this.x = x;
				this.y = y;
			}
		}

		[StructLayout(LayoutKind.Sequential)]
		public struct MINMAXINFO
		{
			public POINT ptReserved;
			public POINT ptMaxSize;
			public POINT ptMaxPosition;
			public POINT ptMinTrackSize;
			public POINT ptMaxTrackSize;
		};

		[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
		public class MONITORINFO
		{
			public int cbSize = Marshal.SizeOf(typeof(MONITORINFO));
			public RECT rcMonitor = new RECT();
			public RECT rcWork = new RECT();
			public int dwFlags = 0;
		}

		[StructLayout(LayoutKind.Sequential, Pack = 0)]
		public struct RECT
		{
			public int left;
			public int top;
			public int right;
			public int bottom;
			public static readonly RECT Empty = new RECT();
			public int Width
			{
				get { return Math.Abs(right - left); }
			}
			public int Height
			{
				get { return bottom - top; }
			}
			public RECT(int left, int top, int right, int bottom)
			{
				this.left = left;
				this.top = top;
				this.right = right;
				this.bottom = bottom;
			}
			public RECT(RECT rcSrc)
			{
				this.left = rcSrc.left;
				this.top = rcSrc.top;
				this.right = rcSrc.right;
				this.bottom = rcSrc.bottom;
			}
			public bool IsEmpty
			{
				get
				{
					return left >= right || top >= bottom;
				}
			}
			public override string ToString()
			{
				if (this == RECT.Empty) { return "RECT {Empty}"; }
				return "RECT { left : " + left + " / top : " + top + " / right : " + right + " / bottom : " + bottom + " }";
			}
			public override bool Equals(object obj)
			{
				if (!(obj is Rect)) { return false; }
				return (this == (RECT)obj);
			}
			public override int GetHashCode()
			{
				return left.GetHashCode() + top.GetHashCode() + right.GetHashCode() + bottom.GetHashCode();
			}
			public static bool operator ==(RECT rect1, RECT rect2)
			{
				return (rect1.left == rect2.left && rect1.top == rect2.top && rect1.right == rect2.right && rect1.bottom == rect2.bottom);
			}
			public static bool operator !=(RECT rect1, RECT rect2)
			{
				return !(rect1 == rect2);
			}
		}

		[DllImport("user32")]
		internal static extern bool GetMonitorInfo(IntPtr hMonitor, MONITORINFO lpmi);

		[DllImport("User32")]
		internal static extern IntPtr MonitorFromWindow(IntPtr handle, int flags);
		#endregion

        #region Constructors

        public SinacorWindowBase()
            : base()
        {
            CommandBindings.Add(new CommandBinding(SinacorWindowCommands.Minimize, btnMinimize_Click));
            CommandBindings.Add(new CommandBinding(SinacorWindowCommands.Maximize, btnMaximize_Click));
            CommandBindings.Add(new CommandBinding(SinacorWindowCommands.Restore, btnRestore_Click));

            //this.SourceInitialized += new EventHandler(win_SourceInitialized);
            this.Loaded += new RoutedEventHandler(SinacorWindowBase_Loaded);
        }

        void SinacorWindowBase_Loaded(object sender, RoutedEventArgs e)
        {
            //adicionado para tratar primeira abertura da janela
            WindowState original = this.WindowState;
            OnPropertyChanged(new DependencyPropertyChangedEventArgs(WindowStateProperty, WindowState.Minimized, original));
        }

        #endregion Constructors

        #region Drag/Drop

        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();

            System.Windows.Controls.Grid header = this.GetTemplateChild("Header") as System.Windows.Controls.Grid;

            if (header != null)
            {
                header.MouseLeftButtonDown += new MouseButtonEventHandler(headerArea_MouseLeftButtonDown);
                header.GotKeyboardFocus += new KeyboardFocusChangedEventHandler(header_GotKeyboardFocus);
                this.MouseDoubleClick += new MouseButtonEventHandler(SinacorWindow_MouseDoubleClick);
            }
        }

        /// <summary>
        /// Tratamento do double click no cabeçalho para maximizar / restaurar a janela
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void SinacorWindow_MouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            System.Windows.Controls.Grid header = e.OriginalSource as System.Windows.Controls.Grid;

            if ((header != null) && (header.Name == "Header"))
            {
                if (this.WindowState == WindowState.Normal)
                {
                    this.WindowState = WindowState.Maximized;
                }
                else if (this.WindowState == WindowState.Maximized)
                {
                    this.WindowState = WindowState.Normal;
                }
            }
        }

        void header_GotKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
        {
            this.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
        }

        void headerArea_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            if (Mouse.LeftButton == MouseButtonState.Pressed)
            {
                this.DragMove();
            }
        }

        #endregion

        #region Minimize/Maximize

        protected void btnMinimize_Click(object sender, EventArgs e)
        {
            this.WindowState = System.Windows.WindowState.Minimized;
        }

        protected void btnMaximize_Click(object sender, EventArgs e)
        {
            this.WindowState = System.Windows.WindowState.Maximized;
        }

        #endregion

        #region Restore

        protected void btnRestore_Click(object sender, EventArgs e)
        {
            this.WindowState = System.Windows.WindowState.Normal;
        }

        #endregion

        protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e)
        {
            ///Codificacao necessaria para que a janela se comporte de forma correta quando o estado ou a largura/altura e alterada
            //
            if (e.Property == WindowStateProperty)
            {
                this.WindowStyle = WindowStyle.SingleBorderWindow;
            }
            else
            {
                if (e.Property == ActualWidthProperty)
                {
                    if (Convert.ToDouble(e.NewValue) < (this.MinWidth) + 1)
                        this.WindowStyle = WindowStyle.SingleBorderWindow;
                }
                else if (e.Property == ActualHeightProperty)
                {
                    if (Convert.ToDouble(e.NewValue) < (this.MinHeight + 1))
                        this.WindowStyle = WindowStyle.SingleBorderWindow;
                }
            }

            base.OnPropertyChanged(e);

            if (e.Property == WindowStateProperty)
            {
                this.WindowStyle = WindowStyle.None;
                AdjustWindowPosition();
            }
            else
            {
                if (e.Property == ActualHeightProperty)
                {
                    if (Convert.ToDouble(e.NewValue) < (this.MinHeight + 1))
                        this.WindowStyle = WindowStyle.None;
                }
                else if (e.Property == ActualWidthProperty)
                {
                    if (Convert.ToDouble(e.NewValue) < (this.MinWidth) + 1)
                        this.WindowStyle = WindowStyle.None;
                }
            }
            //
        }

        /// <summary>
        /// Ajustar a posicao do windows de acordo com a workarea disponivel
        /// </summary>
		void AdjustWindowPosition()
		{
			if (this.WindowState == WindowState.Normal)
			{
				System.Drawing.Rectangle area = System.Windows.Forms.Screen.PrimaryScreen.WorkingArea;
				double left, top;
				left = this.Left;
				top = this.Top;

				if (left < area.Left)
					left = area.Left;

				if (top < area.Top)
					top = area.Top;

				this.Left = left;
				this.Top = top;
			}
		}
    }
}
